One of the very first things you do on Twitter is learn how to quote a Tweet. When retweeting something that a user has said, if you’ve been around the block awhile, you might still be using RT (ReTweet) MT (Modified Tweet) and HT (Hat Tip)

from About.com Twitter: Most Popular Articles http://twitter.about.com/od/Twitter-Basics/ss/How-to-Quote-a-Tweet-Like-a-Super-User.htm
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